U.S. patent application number 14/354797 was filed with the patent office on 2014-10-02 for gasket.
This patent application is currently assigned to NOK CORPORATION. The applicant listed for this patent is NOK CORPORATION. Invention is credited to Jun Furubayashi, Yohei Miki.
Application Number | 20140291940 14/354797 |
Document ID | / |
Family ID | 49041765 |
Filed Date | 2014-10-02 |
United States Patent
Application |
20140291940 |
Kind Code |
A1 |
Miki; Yohei ; et
al. |
October 2, 2014 |
GASKET
Abstract
A gasket made of a rubber-like elastic material is mounted in a
mounting groove provided in one of two opposing members and is
gripped between the one member and the other member so as to be in
pressure contact with the two members. The gasket includes: a body
section inserted in the mounting groove; one support protrusion
provided on one side of the body section so as to be located on the
side of the body section, and mounted in a deep groove provided on
the bottom; the other support protrusion extending in a tilted
manner from the other end side, in the width direction, of the body
section toward the bottom in the direction away from the one
support protrusion; and a lip ridge protrusion provided on the side
of the body section, and located so that the tip thereof does not
overlap the one support protrusion.
Inventors: |
Miki; Yohei; (Aso, JP)
; Furubayashi; Jun; (Aso, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
NOK CORPORATION |
Tokyo |
|
JP |
|
|
Assignee: |
NOK CORPORATION
Tokyo
JP
|
Family ID: |
49041765 |
Appl. No.: |
14/354797 |
Filed: |
December 26, 2012 |
PCT Filed: |
December 26, 2012 |
PCT NO: |
PCT/JP2012/083597 |
371 Date: |
April 28, 2014 |
Current U.S.
Class: |
277/641 |
Current CPC
Class: |
B65D 53/02 20130101;
F16J 15/062 20130101; F16J 15/025 20130101; H05K 5/06 20130101;
H05K 5/061 20130101; F16J 15/104 20130101 |
Class at
Publication: |
277/641 |
International
Class: |
H05K 5/06 20060101
H05K005/06 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 12, 2012 |
JP |
2012-090857 |
Claims
1. A gasket made of a rubber-like elastic material, wherein the
gasket mounted in a mounting groove provided in one of two opposing
members and is gripped between the one member and the other member
so as to be in pressure contact with the two members, wherein the
gasket comprising: a body section being inserted in the mounting
groove; one support protrusion being provided on one end side of
the body section in the width direction so as to be located on the
bottom side of the mounting groove, and being mounted in a deep
groove provided in a part of the bottom; the other support
protrusion extending in a tilted manner from the other end side, in
the width direction, of the body section toward the bottom in the
direction away from the one support protrusion; and a lip ridge
protrusion being provided on the side of the body section facing
the other member, and being located so that the tip thereof does
not overlap the one support protrusion of the body section, and
wherein in a stage of assembling the gasket, the body section is
displaced so as to tilt on the other support protrusion side of
around the one support protrusion, and the other support protrusion
is in contact with the bottom and is deformed.
2. The gasket according to claim 1, wherein an aperture exists
between the other support protrusion and the bottom in a stage
before assembling the gasket, and the other support protrusion is
in contact with the bottom in a stage of assembling the gasket.
3. The gasket according to claim 1, wherein the body section
comprises a flat press surface on the side facing the other member
in which the one support protrusion is provided.
4. The gasket according to claim 1, wherein as for the angles of
both of tilted surfaces to form the lip ridge protrusion of the
gasket, the tilted surface on the side of the other support
protrusion is steeper than the other tilted surface.
5. The gasket according to claim 1, wherein a holding protrusion is
provided on the peripheral surface of the one support
protrusion.
6. The gasket according to claim 1, wherein the other support
protrusion has a length so as not to be in contact with a side
surface of the mounting groove, in the stage of assembling the
gasket.
7. The gasket according to claim 2, wherein the body section
comprises a flat press surface on the side facing the other member
in which the one support protrusion is provided.
8. The gasket according to claim 2, wherein as for the angles of
both of tilted surfaces to form the lip ridge protrusion of the
gasket, the tilted surface on the side of the other support
protrusion is steeper than the other tilted surface.
9. The gasket according to claim 3, wherein as for the angles of
both of tilted surfaces to form the lip ridge protrusion of the
gasket, the tilted surface on the side of the other support
protrusion is steeper than the other tilted surface.
10. The gasket according to claim 2, wherein a holding protrusion
is provided on the peripheral surface of the one support
protrusion.
11. The gasket according to claim 3, wherein a holding protrusion
is provided on the peripheral surface of the one support
protrusion.
12. The gasket according to claim 4, wherein a holding protrusion
is provided on the peripheral surface of the one support
protrusion.
13. The gasket according to claim 2, wherein the other support
protrusion has a length so as not to be in contact with a side
surface of the mounting groove, in the stage of assembling the
gasket.
14. The gasket according to claim 3, wherein the other support
protrusion has a length so as not to be in contact with a side
surface of the mounting groove, in the stage of assembling the
gasket.
15. The gasket according to claim 4, wherein the other support
protrusion has a length so as not to be in contact with a side
surface of the mounting groove, in the stage of assembling the
gasket.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a U.S. National Stage Application of
International Application No. PCT/JP2012/083597 filed on Dec. 26,
2012, and published in Japanese as WO 2013/153715 A1 on Oct. 17,
2013. This application claims priority to Japanese Application No.
2012-090857 filed on Apr. 12, 2012. The disclosures of the above
applications are incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a gasket.
[0004] More particularly, the present invention relates to a gasket
for a case, which is made of a low rigidity material such as
synthetic resins, aluminum or the like, and is used for electronic
apparatuses or the like.
[0005] 2. Description of the Conventional Art
[0006] In a case cover for electronic apparatuses or the like,
which is made of a low rigidity material such as synthetic resins
or the like, a gasket having a low reaction force and having a low
change rate of the reaction force to the compression amount has
been conventionally, mainly used. The gasket has been adopted from
the viewpoint of preventing deformation of a cover and securing
sealing ability to the variation of dimensional accuracy (following
the partial variation of the compression amount) at the time of
fastening.
[0007] As a kind of the gasket, the following gasket illustrated in
FIG. 5 has been known (Japanese Utility Model Laid-Open No.
62-108661). The gasket includes a body section 310 which is
inserted in a mounting groove not illustrated, two lines of support
protrusions 320 and 330, which are provided on the bottom side of
the mounting groove of the body section 310 and extend in parallel
with the body section 310, and a lip ridge protrusion 340 which is
provided on the other side of the body section 310.
[0008] Further, the gasket includes an aperture 350 formed so as to
have a shape capable of absorbing the compression of a rubber-like
elastic material, on the bottom side of a mounting groove on the
surface opposed to the lip ridge protrusion 340.
[0009] However, even having the aforementioned shape, the gasket
300 is not a satisfactory gasket for low reaction force with
respect to a case, which is made of a low rigidity material such as
synthetic resins, aluminum or the like and is used for electronic
apparatuses or the like.
[0010] Then, a gasket 300 having a shape illustrated in FIG. 6 has
been proposed (Japanese Patent Application Laid-Open No.
2004-39341).
[0011] Namely, the gasket 300 is constituted with a body section
310 inserted in a mounting groove 100 of a case (one member) 100,
and a lip ridge protrusion 340 provided on another side of the body
section 310. The lip ridge protrusion 340 has a shape extending in
a tilted manner toward the body section 310.
[0012] Therefore, as illustrated in FIG. 7, it can be expected to
realize low reaction force of the lip ridge protrusion 340 and
improve its followability at the time of gripping the lip ridge
protrusion 340 between one member 100 and the other member 200 so
as to be in pressure contact with the two members.
[0013] However, as for such the lip ridge protrusion 340 having a
structure in a tilted manner, when the gasket 300 is formed and
released, the lip ridge protrusion 340 is removed forcibly.
Therefore, if the lip ridge protrusion 340 has a steeply tilted
shape, there are problems that the lip ridge protrusion 340 is
damaged easily so that the operability is low, or the like.
[0014] On the other hand, if the tilted angle of the lip ridge
protrusion 340 is small, low reaction force is hardly made even if
the lip ridge protrusion 340 falls, and the change of reaction
force to the compression amount increases. In addition, the lip
ridge protrusion 340 to hardly falls in the fixed direction as
planned, and there is a possibility that the lip ridge protrusion
340 may partially fall in the opposite direction. As a result,
lowering the sealing ability is caused.
DISCLOSURE OF THE INVENTION
Problems to be Solved by the Invention
[0015] The purpose of the present invention is to provide a gasket
which can be easily formed, can be compressed largely at low
reaction force, and is highly reliable.
Means for Solving the Problem
[0016] According to an aspect of the present invention, a gasket
made of a rubber-like elastic material is mounted in a mounting
groove provided in one of two opposing members and is gripped
between the one member and the other member so as to be in pressure
contact with the two members. The gasket is provided with: a body
section which is inserted in the mounting groove; one support
protrusion, which is provided on one end side of the body section
in the width direction so as to be located on the bottom side of
the mounting groove, and is mounted in a deep groove provided in a
part of the bottom; the other support protrusion which extends in a
tilted manner from the other end side, in the width direction, of
the body section toward the bottom in the direction away from the
one support protrusion; and a lip ridge protrusion, which is
provided on the side of the body section which faces the other
member, and is located so that the tip thereof does not overlap the
one support protrusion of the body section. In a step when the
gasket is inserted, the body section is displaced so as to tilt on
the other support protrusion side using the one support protrusion
as a fulcrum.
Effectiveness of the Invention
[0017] The present invention has the effects described below.
[0018] According to a gasket of the invention described in the
first aspect of the present disclosure, the gasket can be easily
formed, can be easily formed, can be compressed largely at low
reaction force, and is highly reliable.
[0019] Further, according to a gasket of the invention described in
the second aspect of the present disclosure, the gasket can be
compressed largely at low reaction force, and attitude stability of
the gasket after being inserted is proper.
[0020] Further, according to a gasket of the invention described in
the third aspect of the present disclosure, the gasket can be
easily, certainly mounted in the mounting groove.
[0021] Further, according to a gasket of the invention described in
the fourth aspect of the present disclosure, since the lip ridge
protrusion constantly falls in the fixed direction as planned,
reliability of the sealing ability can increase.
[0022] Further, according to a gasket of the invention described in
the fifth aspect of the present disclosure, the gasket can be
easily inserted in the mounting groove, and it can be prevented
more certainly that the gasket falls on the inner peripheral side
of the mounting groove.
[0023] Furthermore, according to a gasket of the invention
described in the sixth aspect of the present disclosure, the gasket
can be compressed largely by further lower reaction force and is
further highly reliable.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] FIG. 1 is a cross-sectional view of a gasket according a
first embodiment of the present invention
[0025] FIG. 2 is a cross-sectional view of a state that the gasket
in FIG. 1 is inserted in a mounting groove
[0026] FIG. 3 is a cross-sectional view of a state that the other
member is assembled to FIG. 2 and the gasket is gripped in pressure
contact
[0027] FIG. 4 is a view illustrating a second embodiment of the
present invention, which is similar to FIG. 1
[0028] FIG. 5 is a cross-sectional view of a gasket according to a
conventional technique
[0029] FIG. 6 is a cross-sectional view of the other gasket
according to a conventional technique
[0030] FIG. 7 is a cross-sectional view illustrating a state that
the other member is assembled to FIG. 6 and the gasket is gripped
in pressure contact
PREFERRED EMBODIMENTS FOR CARRYING OUT OF THE INVENTION
[0031] Preferred embodiments for carrying out of the present
invention will be described below.
[0032] A gasket as a first embodiment according to the present
invention is a gasket 3 made of a rubber-like elastic material. As
illustrated in FIGS. 1, 2 and 3, the gasket 3 is mounted in a
mounting groove 11 provided in one of two opposing members 1 and 2
and is gripped between the one member 1 and the other member 2 so
as to be in pressure contact with the two members 1 and 2.
[0033] Further, the gasket 3 is provided with: a body section 31
which is inserted in the mounting groove 11; one support protrusion
33, which is provided on one end side 312 of the body section 31 in
the width direction so as to be located on the bottom 111 side of
the mounting groove 11, and is mounted in a deep groove 112
provided in a part of the bottom 111; the other support protrusion
32 which extends in a tilted manner from the other end side 313, in
the width direction, of the body section 31 toward the bottom 111
in the direction away from the one support protrusion 33; a lip
ridge protrusion 34 being provided on the side of the body section
31 facing the other member 2, and being located so that the tip 343
thereof does not overlap the one support protrusion 33 of the body
section 31.
[0034] The tilted angle of the other support protrusion 32 with
respect to the bottom 111 is within a range from 15 to 45 degrees.
If the tilted angle is smaller than 15 decrees, a proper sealing
surface pressure cannot be obtained. If the tilted angle is larger
than 45 degrees, the other support protrusion 32 is removed
forcibly at the time of forming and releasing. Therefore, if the
other support protrusion 32 has a steeply tilted shape, there are
problems that the other support protrusion 32 is damaged easily so
that the operability is low, or the like.
[0035] Further, the lip ridge portion 34 is formed so as to be
upright to the bottom 111.
[0036] Further, in a state of assembling the gasket 3, as
illustrated in FIG. 3, the body section 31 is the body section 31
is displaced so as to tilt on the other support protrusion 32 side
using the one support protrusion 33 as a fulcrum.
[0037] As mentioned above, the other support protrusion 32 has a
shape extending from the other end side 313, in the width
direction, of the body section 31 toward the bottom 111 in the
direction away from the one support protrusion 33. As a result,
when the lip ridge protrusion 34 is pressed by the other member 2,
the lip ridge protrusion 34 is easily deformed as illustrated in
FIG. 3. Therefore, the gasket can be easily formed, can be
compressed largely at low reaction force, and is highly
reliable.
[0038] Further, as illustrated in FIG. 3, the one support
protrusion 33 stably holds the gasket 3 on the side of the one
member 1, and the other support protrusion 32 contacts with the
bottom 111 of the mounting groove 11 at a wide area. Therefore,
proper sealing ability can be exerted.
[0039] Further, in the constitution of the present invention, an
aperture X exists between the other support protrusion 32 and the
bottom 111 in a stage before assembling the gasket 3, and the other
support protrusion 32 contacts with the bottom 111 in a stage of
assembling the gasket 3, as illustrated in FIG. 2. Therefore, the
gasket can be compressed largely at low reaction force, and the
attitude stability of the gasket after being assembled is
proper.
[0040] Furthermore, the body section 31 includes a flat press
surface 311 on the side facing the other member 2 in which the one
support protrusion 33 is provided. Therefore, when the gasket 3 is
mounted in the mounting groove 11, the press surface 311 is pressed
by a jig, so that the gasket 3 can be mounted easily. In addition,
the gasket 3 can be mounted certainly.
[0041] Further, as illustrated in FIG. 1, as for the angles of both
of tilted surfaces 341 and 342, which form the lip ridge protrusion
34 of the gasket 3, the tilted surface 341 on the side of the other
support protrusion 32 is steeper than the other tilted surface
342.
[0042] Therefore, the lip ridge protrusion 34 constantly falls in
the fixed direction (on the left side in FIG. 1) as planned, so
that the reliability of sealing ability can be more improved.
[0043] Further, as illustrated in FIG. 3, the gasket 3 is designed
to have a length so that the tip of the other support protrusion 32
does not contact with a side surface 113 of the mounting groove 11,
in the stage of assembling the gasket 3. As a result, displacing
the other support protrusion 32 is not prevented by the side
surface 113 of the mounting groove 11, so that gasket 3 can be
compressed largely at low reaction force and is highly
reliable.
[0044] A material used for a gasket 1 is a rubber-like elastic
material.
[0045] As the rubber material, nitrile rubber, acrylic rubber,
EPDM, CR, silicone rubber, fluoro-rubber, natural rubber or the
like can be used, and the rubber material can be selected properly
from the rubbers according to a use.
[0046] The strength of a rubber is preferably Hs 40 to Hs 60. It is
important that the strength is smaller than Hs 70 so as to have low
reaction force.
[0047] Then, the second embodiment of the present invention will be
described below with reference to FIG. 4.
[0048] The point which is different from the first embodiment is
the point that a holding protrusion 331 is provided on the
peripheral surface of the one support protrusion 33.
[0049] The plural holding protrusions 331 are provided at equal
intervals on the inner peripheral side (the left side in FIG. 4) of
the one support protrusion 33.
[0050] Further, when the gasket 3 is inserted in the deep groove
112 of the mounting groove 11, the holding protrusion 331 contacts
with the peripheral surface of the deep groove 112, so that the
gasket 3 is assembled in a state of being gripped in pressure
contact with the two members.
[0051] Therefore, according to the second embodiment of the present
invention, insertion resistance of the gasket 3 to the mounting
groove 11 can decrease. As a result, the gasket 3 can be easily
inserted in the deep groove 112, and it can be prevented more
certainly that the gasket 3 falls on the inner peripheral side of
the mounting groove 11.
INDUSTRIAL APPLICABILITY
[0052] The gasket according to the present invention can be used as
a gasket for a case, which is made of a low rigidity material such
as synthetic resins, aluminum or the like and is used for
electronic apparatuses or the like.
* * * * *